<script setup lang="ts">
import { computed, onMounted, ref, watch } from 'vue';

// 定义水果对象的类型
interface Fruit {
  id: number
  icon: string
  isChecked: boolean
  num: number
  price: number
}

onMounted(() => {
    getDataFromStorage()
})
// 从本地存储中读取数据
const getDataFromStorage = () => {
  const str = localStorage.getItem("fruit")
  if(str) {
    const parseObj = JSON.parse(str) as Fruit[]
    if(parseObj.length) {
        fruitList.value = parseObj
    }
  } 
}



// 水果列表
const fruitList = ref<Fruit[]>([
  {
    id: 1,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/ll.png',
    isChecked: true,
    num: 2,
    price: 6,
  },
  {
    id: 2,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png',
    isChecked: false,
    num: 7,
    price: 20,
  },
  {
    id: 3,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/tg.png',
    isChecked: false,
    num: 3,
    price: 40,
  },
  {
    id: 4,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/xg.png',
    isChecked: false,
    num: 10,
    price: 3,
  },
  {
    id: 5,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/yl.png',
    isChecked: false,
    num: 20,
    price: 34,
  },
]) 

const delFruit = (id: number) => {
    const index = fruitList.value.findIndex(item => item.id === id)
    if(index > -1) {
        fruitList.value.splice(index, 1)
    }
}

// 计算属性 - 全选-> 所有的勾选 - 有一个变化 -> 全选
const isAllChecked = computed({
    set(value: boolean) {
        // 点击全选按钮时执行
      fruitList.value.forEach(item => {
        item.isChecked = value
      })
    },
    get() {
        // fruitList中任何一项的勾选发生变化都会执行
       return fruitList.value.every(item => item.isChecked)
    }
 })

 watch(fruitList, (newArr) => {
   localStorage.setItem("fruit", JSON.stringify(fruitList.value))
 }, {
    deep: true
 })
</script>

<template>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/sg_top.png" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div v-if="fruitList.length" class="main">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div v-for="item in fruitList" :key="item.id" class="tr">
            <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td">{{ item.price }}</div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease" :disabled="item.num <= 1" @click="item.num--"> - </button>
                <span class="my-input__inner">{{ item.num }}</span>
                <button class="increase" @click="item.num++"> + </button>
              </div>
            </div>
            <div class="td">{{ item.num * item.price }}</div>
            <div class="td"><button @click="delFruit(item.id)">删除</button></div>
          </div>
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox"  v-model=" isAllChecked"/>
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">24</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( 6 )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div v-else class="empty">🛒 空空如也</div>
  </div>
</template>

<style scoped>
@import '../style/inputnumber.css';
@import '../style/index.css';
</style>